1999/11/17 by S. Fajfer, S. Prelovsek, P. Singer
Physics and Astronomy · #hep-ph
published as IJS-TP/99-29 · 6 pages; presented at Heavy Flavours 8, Southampton, UK, 1999
arxiv created 1999/11/17 · arxiv updated 2009/11/30
We propose the Bc→ Bu^*γ decay as the most suitable probe for the flavour changing neutral transition c→ uγ. We estimate the short and long distance contributions to this decay within the standard model and we find them to be comparable; this is in contrast to radiative decays of D mesons, that are completely dominated by the long distance contributions. Since the c→ uγ transition is very sensitive to the physics beyond the standard model, the standard model prediction Br(Bc→ Bu^*γ)∼ 10-8 obtained here opens a new window for future experiments. The detection of Bc→ Bu^*γ decay at branching ratio well above 10-8 would signal new physics.